2205 Duplex Stainless Steel (UNS S31803/S32205) is a nitrogen-enhanced ferritic-austenitic stainless steel known for its superior corrosion resistance and high strength. With a Pitting Resistance Equivalent Number (PREN) over 34, it outperforms 316L in chloride environments. As of 2026, 2205 is the industry standard for pharmaceutical, biotech, and chemical processing equipment due to its stress corrosion cracking resistance and cost-effectiveness.
At Huaxiao Metal, we supply high-quality 2205 duplex stainless steel in various forms including plates, sheets, coils, bars, and pipes, with stable inventory and global export experience.
👉 Looking for reliable 2205 stainless steel suppliers? Contact Huaxiao Metal today for stock availability and latest pricing.
What is 2205 Duplex Stainless Steel?
2205 duplex stainless steel is a “biphasic” microstructure consisting of approximately 50% ferrite and 50% austenite. This dual-phase structure provides the best of both worlds: the stress corrosion cracking resistance of ferritic steels and the ease of fabrication of austenitic steels.
In the 2026 global market, the dual-certified S32205/S31803 has become the most widely used grade in the duplex family, bridging the gap between standard 300-series stainless steels and high-cost super duplex alloys.
2205 Duplex Stainless Steel Data Sheet
Features
1) The resistance to salt corrosion, pressure corrosion cracking (SCC), pitting corrosion, crevice corrosion, abrasion and erosion is very excellent; compared with 316L and 317L
austenitic stainless steel, 2205 steel is more resistant to corrosion damage. The performance of cracks is superior, it has high corrosion resistance;
2) Compared with general austenitic stainless steel, the thermal expansion coefficient is lower, and the thermal conductivity is higher;
3) High strength, compared with austenitic stainless steel, Its compressive strength is twice that.
4) Improve the life of chemical and seawater equipment, and improve the economy of environmental protection equipment.
5) This alloy is especially suitable for the temperature range of -50°F+600°F, under limited circumstances (especially for welded structures), it can also be used at lower temperatures.
Chemical composition (JIS G 4305-2005) (wt%)
Chemical composition | C | Si | Mn | P | S | Cr | Ni | Mo | N |
Standard | 0.03 | 1.00 | 2.00 | 0.04 | 0.03 | 21.0~24.0 | 4.5~6.5 | 2.5~3.5 | 0.08~0.2 |
| General | 0.025 | 0.6 | 1.5 | 0.026 | 0.001 | 22.5 | 5.8 | 3.0 | 0.16 |
Performance (JIS G 4305-2005)
Distinguish | Mechanical performance | Note | |||
| Ys (Mpa) | Ts (Mpa) | El (%) | Hv | 2.0t/2B | |
Standard | ≥ 450 | ≥ 620 | ≥ 18 | ≤ 320 | |
| General | 670 | 875 | 27 | 280 | |
Physical performance
Density (g/cm3) | Magnetic | Specific heat (J/g.0C) | Thermal conductivity 1000C(W/m. 0C) | Thermal expansion rate 20~1000C (10-6/0C) |
| 7.8 | with | 0.45 | 19.0 | 13.7 |
Global Equivalent Mapping
ASTM/UNS: S31803 / S32205
EN/DIN: 1.4462 (X2CrNiMoN22-5-3)
JIS: SUS 329J3L
AFNOR: Z2 CND 22-05-03
Heat treatment
Solution treatment: 950~11000C, quenching. Generally, the ratio of ferrite and austenite is controlled at about 50%, and generally the content of the least phase may reach 30%.
Use state
annealing and solid solution state: No. 1, 2D, 2B and other surface treatment states.
Superior Corrosion Resistance
The high Chromium (Cr), Molybdenum (Mo), and Nitrogen (N) content gives 2205 excellent resistance to pitting and crevice corrosion.
PREN Value: Typically 34-36.
Chloride Stress Corrosion Cracking (SCC): Unlike 304 and 316L, 2205 is virtually immune to SCC in temperatures up to 150°C.
High Mechanical Strength
2205 provides roughly double the yield strength of 316L. This allows engineers to design thinner-walled vessels and piping, significantly reducing the total weight and material cost of a project.
Thermal Expansion & Conductivity
Duplex 2205 has higher thermal conductivity and a lower coefficient of thermal expansion than austenitic stainless steels, making it ideal for heat exchangers and pressure vessels.
Advantages and Limitations of 2205 Duplex Stainless Steel
Advantages
✔ High strength (reduces material thickness and weight)
✔ Excellent corrosion resistance
✔ Good weldability
✔ Cost-effective compared to super duplex grades
Limitations
✖ Not suitable for temperatures above 300°C
✖ Requires controlled welding procedures
✖ Lower formability compared to austenitic steels
Applications of 2205 Duplex Stainless Steel
Due to its unique properties, 2205 is widely used across multiple industries:
1. Oil & Gas Industry
- Pipelines
- Pressure vessels
- Heat exchangers
2. Marine Engineering
- Seawater systems
- Ship components
- Offshore structures
3. Chemical Processing
- Storage tanks
- Reactors
- Piping systems
4. Pharmaceutical & Biotechnology
- Clean piping systems
- Hygienic equipment
- Sterile processing units
👉 2205 provides excellent corrosion resistance and cleanliness, making it suitable for GMP environments.
👉 Need 2205 stainless steel for industrial or pharmaceutical use? Contact Huaxiao Metal for technical support and pricing.
2205 in Pharmaceutical & Biotechnology
One of the most significant shifts in 2026 is the increasing replacement of 316L with 2205 in the Biopharmaceutical sector.
Why 2205 is Dominating Biotech?
In pharmaceutical manufacturing, equipment is frequently exposed to harsh cleaning agents (CIP/SIP) and high-chloride saline solutions.
Microbial Resistance: The smooth, high-density surface of 2205 prevents biofilm adhesion.
Durability in Bio-reactors: 2205 handles the cyclic stress and corrosive media in bio-fermentation tanks better than traditional alloys.
Cleanability and Surface Finish
For biotech applications, 2205 can be electropolished to a roughness of Ra < 0.4 μm, meeting stringent FDA and ASME BPE standards for purity and sterility.
2205 Duplex Stainless Steel In The Field Of Pharmaceutical And Biotechnology
2205 vs 304 vs 316 Stainless Steel
| Feature | 2205 Duplex | 316 | 304 |
|---|---|---|---|
| Strength | Very High | Medium | Low |
| Corrosion Resistance | Excellent | Good | Moderate |
| Cost | Medium | Medium-High | Low |
| Chloride Resistance | Excellent | Good | Poor |
👉 If your project involves chloride environments or high stress, 2205 is the best choice.
Due to the characteristics of two-phase structure, through correct control of chemical composition and heat treatment process, it has the advantages of both ferritic stainless steel and austenitic stainless steel.
Compared with austenitic stainless steel, the advantages of duplex stainless steel are as follows:
1) The yield strength is more than twice that of ordinary austenitic stainless steel, and it has sufficient plastic toughness for forming. The wall thickness of storage tanks or pressure vessels made of duplex stainless steel is 30-50% less than that of commonly used austenite, which is beneficial to reduce costs;
2) It has excellent resistance to stress corrosion cracking, even the lowest alloy content Duplex stainless steels also have higher resistance to stress corrosion cracking than austenitic stainless steels, especially in environments containing chloride ions. Stress corrosion is a prominent problem that ordinary austenitic stainless steel is difficult to solve;
3) The 2205 duplex stainless steel, which is most commonly used in many media, has better corrosion resistance than ordinary 316L austenitic stainless steel, while super duplex stainless steel has extremely high corrosion resistance. In some mediums, such as acetic acid, formic acid, etc., it can even replace high-alloy austenitic stainless steels and even corrosion-resistant alloys.
4) It has good local corrosion resistance. Compared with austenitic stainless steel with the same alloy content, its wear corrosion resistance and fatigue corrosion resistance are better than austenitic stainless steel;
5) Linear expansion than austenitic stainless steel Low coefficient, close to carbon steel, suitable for connection with carbon steel, with important engineering significance, such as the production of composite plates or linings, etc.;
6) No matter under dynamic or static load conditions, it has higher energy than austenitic stainless steel Absorptive capacity, which is suitable for structural parts to cope with sudden accidents such as collisions and explosions. Duplex stainless steel has obvious advantages and has practical application value.
Compared with austenitic stainless steel, the disadvantages of duplex stainless steel are as follows:
1) The universality and versatility of application are not as good as austenitic stainless steel, for example, its service temperature must be controlled below 250 degrees Celsius;
2) Its plastic toughness is more austenitic Stainless steel is low, cold and hot processing technology and forming performance are not as good as austenitic stainless steel;
3) There is a medium temperature brittle zone, the heat treatment and welding process system needs to be strictly controlled to avoid the appearance of harmful phases and damage performance.
Compared with ferritic stainless steel, the advantages of duplex stainless steel are as follows:
1) Comprehensive mechanical properties are better than ferritic stainless steel, especially plastic toughness, not as sensitive to brittleness as ferritic stainless steel;
2) In addition to stress corrosion resistance In addition, other local corrosion resistance performance is better than ferritic stainless steel;
3) Cold working process performance and cold forming performance are much better than ferritic stainless steel;
4) Welding performance is also much better than ferritic stainless steel, generally not required before welding Preheating, no need for heat treatment after welding;
5) The application range is wider than ferritic stainless steel.
Compared with ferritic stainless steel, the disadvantages of duplex stainless steel are as follows:
1) The content of alloying elements is high and the price is relatively high. Generally, ferrite does not contain nickel.
2205 Duplex Stainless Steel Price Guide (2026)
The price of 2205 stainless steel depends on several factors:
Key Price Factors
- Raw material cost (Ni, Mo content)
- Product form (plate, coil, pipe)
- Thickness and dimensions
- Surface finish
- Order quantity (MOQ)
Market Insight
- 2205 is generally more expensive than 304, but
- more cost-effective than 316 in long-term use due to durability and lower maintenance
👉 Get the latest 2205 stainless steel price today from Huaxiao Metal – fast quotation within 24 hours.
How to Choose a Reliable 2205 Stainless Steel Supplier
Choosing the right supplier is critical for quality and cost control.
What to Look For:
✔ Mill test certificates (MTC)
✔ Stable inventory
✔ Export experience
✔ Custom processing capability
✔ Fast delivery
Why Choose Huaxiao Metal?
- Over 15 years of export experience
- Full range of stainless steel products
- Competitive pricing & stable supply
- Professional international sales team
👉 Send your RFQ now and get expert support from Huaxiao Metal.
FAQ – 2205 Duplex Stainless Steel
What is 2205 duplex stainless steel used for?
2205 is widely used in oil & gas, marine, chemical, and pharmaceutical industries due to its high strength and corrosion resistance.
Is 2205 better than 316 stainless steel?
Yes, in terms of strength and corrosion resistance, especially in chloride environments. However, 316 may be preferred for easier forming and welding.
Can 2205 be used in pharmaceutical applications?
Yes. 2205 is suitable for certain pharmaceutical systems due to its corrosion resistance and cleanability, especially in chloride-rich environments.
What is the difference between S32205 and S31803?
S32205 is an improved version of S31803 with tighter composition control, offering better corrosion resistance and performance.
How much does 2205 stainless steel cost?
Prices vary depending on specifications and market conditions. Contact Huaxiao Metal for the latest quotation.
Can 2205 be used in extremely low temperatures?
2205 is generally recommended for use from -50°C to 300°C. Below -50°C, it undergoes a ductile-to-brittle transition.
Is 2205 magnetic?
Yes, due to its 50% ferritic structure, 2205 duplex stainless steel is strongly magnetic, unlike 304 or 316.
How does 2205 compare to 316L in pharmaceutical water systems?
2205 offers significantly better resistance to “pitting” caused by purified water containing trace chlorides, extending the equipment life by 2-3 times compared to 316L.
In Conclusion
2205 duplex stainless steel (S32205/S31803) is an ideal material for applications requiring high strength, excellent corrosion resistance, and long-term cost efficiency. Whether you are working in marine, chemical, or pharmaceutical industries, 2205 provides a reliable and durable solution.
👉 Contact Huaxiao Metal today to get the best 2205 duplex stainless steel price, stock details, and technical support.
